Method and apparatus of power control in a cdma dispatch system

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04Q 7/30 (2006.01) H04Q 7/28 (2006.01) H04Q 7/32 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2257213

In a dispatch system, power of the forward link broadcast channel transmitted from a base station is controlled such that the power level is the minimum necessary and such that transmission of the forward link broadcast channel is terminated if no remote unit (10) is Located within the coverage area of the base station (32). In addition to transmitting a forward link broadcast signal, the base station monitors an access channel. A first remote unit (10) in the base station coverage area receives and decodes the forward link broadcast signal. The first remote unit (10) determines a signal quality of said forward link broadcast signal. If the signal quality is unacceptable, the remote unit transmits a power request access message. The base station responds to the request by increasing the transmission power of forward link broadcast channel (70). If no requests are received at the base station, the forward link broadcast channel is slowly decreased to a minimum (54). Transmission of the forward link broadcast channel may be terminated completely (58).

Dans un système de gestion de flotte de mobiles, la puissance du canal de radiodiffusion de la liaison aval transmise depuis une station de base est régulé e de sorte que le niveau de puissance soit le minimum nécessaire et que la transmission du canal de radiodiffusion de la liaison aval soit arrêtée si aucune unité éloignée (10) n'est placée dans la zone desservie par la station de base (32). Outre la transmission d'un signal de radiodiffusion de la liaison aval, la station de base assure le contrôle d'un canal d'accès. Une première unité éloignée (10) dans la zone desservie par la station de base reçoit et décode le signal de radiodiffusion de liaison aval. La première unité éloignée (10) détermine une qualité de signal dudit signal de radiodiffusion de la liaison aval. Si la qualité du signal est inacceptable, l'unité éloignée transmet un message d'accès à la demande de puissance. La station de base répond à la demande en augmentant la puissance de transmission du canal de radiodiffusion de liaison aval (70). Si aucune demande n'est reçue au niveau de la station de base, le canal de radiodiffusion de liaison aval est réduit lentement jusqu'à un minimum (54). La transmission du canal de radiodiffusion de liaison aval peut être arrêtée entièrement (58).

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